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23,598 Article Results

Parallel Graph Transformation based on Merged Approach

10.11591/ijra.v2i2.pp50-55
Asmaa Aouat , El Abbassia Deba
Graph transformation is one of the key concepts in graph grammar. In order to accelerate the graph transformation, the concept of parallel graph transformation has been proposed by different tools such as AGG tool. The theory of parallel graph transformation used by AGG just allows clarifying the concepts of conflict and dependency between the transformation rules. This work proposes an approach of parallel graph transformations which enables dependent transformation rules to be executed in parallel.
Volume: 2
Issue: 2
Page: 50-55
Publish at: 2013-06-01

Limitations to Understanding Scientific Concepts and Academic Performance in Primary Science among Primary Six Pupils in Cross River State Nigeria

https://ijere.iaescore.com/index.php/IJERE/article/view/4442
Bernedette U. Cornelius-Ukpepi , Obinna O. Enukoha
This study examined the relationship between limitations to understanding scientific concepts and academic performance in Primary Science among primary six pupils in Cross River State, Nigeria. In order to achieve the set objectives of this study, two hypotheses were formulated and tested.  Two instruments were used for data collection. They were limitations to understanding scientific concepts questionnaire (LUSCQ) and a 50-item primary science achievement test.  These instruments were validated and administered to 1818 pupils out of  68,201 pupils in 70 schools in the study population. A proportionate stratified random sampling technique was adopted hence; the study area was stratified into three educational zones with different populations. The data obtained were analyzed using Pearson Product Moment Correlation Coefficient (r) statistical tests at 0.05 level of significance.  The major finding of this study was that there was a significant relationship between limitations to understanding scientific concepts and academic performance in primary science.  Based on the findings, it was concluded that if pupils study scientific concepts adequately and  grasping the knowledge of technical terms in science and have adequate experience of science concepts,  it will help them to perform well in primary science.DOI: http://dx.doi.org/10.11591/ijere.v2i2.1716
Volume: 2
Issue: 2
Page: 85-92
Publish at: 2013-06-01

Detection of Watermelon Seeds Exterior Quality based on Machine Vision

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2316
Xiai Chen , Ling Wang , Wenquan Chen , Yanfeng Gao
To investigate the detection of watermelon seeds exterior quality, a machine vision system based on least square support vector machine was developed. Appearance characteristics of watermelon seeds included area, perimeter, roughness, minimum enclosing rectangle and solidity were calculated by image analysis after image preprocess.The broken seeds, normal seeds and high-quality seeds were distinguished by least square support vector machine optimized by genetic algorithm. Compared to the grid search algorithm, the classification results of watermelon seeds exterior quality achieved by genetic algorithm were analyzed in detail. Meanwhile machine vision grid laser was applied to detect the surface irregularities defects of watermelon seeds. This study demonstrated the feasible of detecting the watermelon seeds exterior quality by machine vision. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2605
Volume: 11
Issue: 6
Page: 2991-2996
Publish at: 2013-06-01

Power of Sentences in Foreign Language Classes

https://ijere.iaescore.com/index.php/IJERE/article/view/4439
Mozhgan Alsadat Ghaffarzadeh Hassankiadeh
Memorizing and rote learning are the simplest ways to get mark, but they won't help learners to use what they have memorized. In fact, learners will carry out a huge amount of knowledge but they can't apply them. In this study a powerful and important tool is introduced to solve the problem in Iranian classes. And it is utilizing sentences. In this article, a flowchart of sentence plan, which was constructed to aid learners in applying what they have learned, was included. The study highlights the importance of sentences in learning a language and introduces playing as an effective procedure to assist learners in learning how to construct correct sentences.DOI: http://dx.doi.org/10.11591/ijere.v2i2.1668
Volume: 2
Issue: 2
Page: 60-68
Publish at: 2013-06-01

Impact of Distributed Generation on Relay Protections of Distribution Grid

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2351
Zhou Bin , Ying Liming , Zhu Yonggang , Huang Chao
Distributed Generation (DG) generates electricity from many small distributed energy sources or even customer’s small power plants. It always comes up with the terminal customer power quality management and the technology of energy cascade utilization. DG has lots of characteristics such as one single point of access, being power and being load, two operating mode in a grid or as an island, a great deal of application of power electronic devices, easily influenced by natural environmental factors etc. DG has impacts to the original grid in terms of the grid structure, the direction of power flow, the fault current level when a fault happens, etc and subsequently the relay protection mechanism must be looked into. This paper analyses the impact of accessing the DG on the distributed grid in three cases which are the DG accessing to the end of the distributed feeders, to the middle, and the DG accessing to lines, on relay protections. At the end of the paper it also comes up with improvements in detail. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2674
Volume: 11
Issue: 6
Page: 3236-3241
Publish at: 2013-06-01

Voltage Profile Improvement of Distribution System using Distributed Generating Units

https://ijece.iaescore.com/index.php/IJECE/article/view/5457
Gummadi Srinivasa Rao , Y.P Obulesh
The power system utilities are increasing everyday,to enhance the distribution power quality and maintains the voltage stability is a challenging tasks in the complex distribution This can be achieved through the Distributed Generation (DG).DGs are the final link between the high voltage transmission and the consumers,it is also known as Active Distribution networks(ADN).This will effectively improve the acive power loss reduction This paper represents technique to minimize power losses in a distribution feeder by optimizing DG model in terms of size, location and operating point of DG. Sensitivity analysis for power losses in terms of DG size and DG operating point has been performed. The proposed sensitivity indices can indicate the changes in power losses with respect to DG current injection. The proposed technique has been developed with considering load characteristics and representing constant current model. The effectiveness of the proposed technique is tested and verified using MATLAB software on long radial distribution system.DOI:http://dx.doi.org/10.11591/ijece.v3i3.2133
Volume: 3
Issue: 3
Page: 337-343
Publish at: 2013-06-01

Design of High performance and Low power Simultaneous Multi-Threaded Processor

https://ijece.iaescore.com/index.php/IJECE/article/view/5468
Krishan Arora , Paramveer Singh Gill , Parul Mehra
In this paper, we present the design of a High Performance Multi-Threaded Processor. Processing of high quality images is inevitable in applications such as, HD TV, Gaming Multimedia, etc. which require a great processing power with low power consumption. This can be achived with multi-threaded processors which optimally utilises the Functional Units (Fus). The speed of processing is as good as multi-core processors with lesser area. A conflict resolver (CR) is designed for scheduling the instructions, which involves allocation of Fu. The data move instructions are in majority in any of the programs; the corresponding logic blocks are replicated and speed of execution is further improved. We illustrated for two-threaded processorHowever, it is possible to extend the design for any number of threads by suitably redesigning the CR, and also replicate Transfer Logic and CPU Registers.DOI:http://dx.doi.org/10.11591/ijece.v3i3.2530
Volume: 3
Issue: 3
Page: 423-428
Publish at: 2013-06-01

Directionality based Location Discovery Scheme Using Beacon Nodes with Transmission Capabilities throughout Sensor Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2374
Qinli An , Jianfeng Chen
In this paper, we propose a range-free localization scheme for wireless sensor networks (WSNs) using four beacon nodes(BNs) equipped with a directional antenna with special transmission capabilities for sending wireless beacon signals throughout the sensor network. Each beacon node rotates with a constant angular speed and broadcasts its angular bearings. A sensor node can determine its location by listening to wireless transmissions from the four fixed beacon nodes. The proposed method is based on an angle-of-arrival estimation technique that does not increase the complexity or cost of construction of the sensor nodes. We present error analysis and the best positions of beacon nodes in the proposed method. Numerical results, obtained by simulating several scenarios, show that the algorithm can reach a good level of convergence. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2705
Volume: 11
Issue: 6
Page: 3398-3406
Publish at: 2013-06-01

Solving Economic Dispatch Problem with Valve-Point Effect using a Modified ABC Algorithm

https://ijece.iaescore.com/index.php/IJECE/article/view/5462
Hardiansyah Hardiansyah
This paper presents a new approach for solving economic dispatch (ED) problem with valve-point effect using a modified artificial bee colony (MABC) algorithm. Artificial bee colony algorithm is a recent population-based optimization method which has been successfully used in many complex problems. This paper proposes a novel best mechanism algorithm based on a modified ABC algorithm, in which a new mutation strategy inspired from the differential evolution (DE) is introduced in order to improve the exploitation process. To demonstrate the effectiveness of the proposed method, the numerical studies have been performed for two different sample systems. The results of the proposed method are compared with other techniques reported in recent literature. The results clearly show that the proposed MABC algorithm outperforms other state-of-the-art algorithms in solving ED problem with the valve-point effect.DOI:http://dx.doi.org/10.11591/ijece.v3i3.2518
Volume: 3
Issue: 3
Page: 377-385
Publish at: 2013-06-01

UML Modeling for Dynamic Logistics System Based on DEVS

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2211
Zhang Zhiyong , Liu Jie , Zhang Xinhui
DEVS is a hierarchical and modular system descriptive method. However, it cannot describe dynamic process and relationship of system members. This article has proposed a way to extend UML using stereotype, making it suitable for simulation modeling. To build a modeling tool, we defined atomic model class and coupled model class, both of which are in line with not only DEVS’s hierarchical and modular requirements but also UML’s object-oriented characteristics. At last, we use the tool to analyze and build UML models for a dynamic logistics system, the container berth system, making it easier to implement on simulation platform. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2397
Volume: 11
Issue: 4
Page: 2168-2173
Publish at: 2013-06-01

Nondestructive Determination Of Beans Water Absorption Capacity Using CFA Images Analysis For Hard-To-Cook Evaluation

10.11591/ijece.v3i3.pp317-328
Boukar Ousman , Laurent Bitjokaa , Gamraïkréo Djaowéa
Hard to cook (HTC) phenomenon is developed by storing bean grains under the adverse conditions of high temperature (≥ 25 °C ) and high humidity (≥ 65 %).  Bean grains that have undergone this HTC phenomenon are characterized by loss of color lightness, development of  browning and darkening,  and decrease of Water Absorption Capacity (WAC). The objective of this study was to develop a CFA (Color Filter Array) image processing system to measure Water Absorption Capacity (WAC) of bean grains with high precision in short time intervals (10 min). The relationships between the CFA image features, extracted from raw images captured by CCD (charge coupled device) camera, and the measured WAC were established. The calibration models using multiple linear regression (MLR) were developed to predict WAC. The MLR models for prediction samples resulted in correlation coefficient (R2) in the range of 0.811 to 0.947, standard error of prediction (SEP) in the range of 7.587 to 11.669, and Fisher variable value (F)  in the range of 52.300 to 221.690. Results indicate that computer vision system (CVS) based on CFA image analysis technique can provide an accurate, reliable and nondestructive measurement method of WAC to evaluate the hard to cook defect in bean grains.DOI:http://dx.doi.org/10.11591/ijece.v3i2.2149
Volume: 3
Issue: 3
Page: 317-328
Publish at: 2013-06-01

Blind equalization based on T/4 fractionally spaced decision feedback equalizer with RLS algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2310
Ying XIAO
To further improve the performance of blind equalization based on T/4 fractionally spaced decision feedback equalizer, RLS algorithm is adopted to update the weights of equalizer according to simplified constant modulus algorithm (CMA) cost function. CMA cost function is simplified to meet second norm form in this work, and then the forward filter of equalizer with T/4 fractionally-spaced updates by RLS algorithm and the feedback filter of equalizer with symbol-spaced updates by gradient descent algorithm. Computer simulation results show that the algorithm proposed in this work has faster convergence rate and lower mean square error compare with blind equalization based on symbol-spaced and T/4 fractionally-spaced decision feedback equalizer based on gradient descend algorithm.DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2156
Volume: 11
Issue: 6
Page: 2948-2955
Publish at: 2013-06-01

The Optimization of Lateral Control Augmentation Based on Genetic Algorithms

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2312
Liu Xiaoxiong , Wang Juan , Wu Yan , Liu Yu
The control augmentation systems are very important to keep the stability and manipulability in the flight control systems. The general flight control laws are designed by static designs and dynamic fits. To improve the adaptive capability, a new method of control laws design was introduced by using dynamic optimization genetic algorithms. The control parameters were adjusted online in the flight envelope. The dynamic optimization model was built for aircraft lateral control augmentation function. The control parameters were regulated by dynamic optimization genetic algorithms. Finally an example of a lateral flight control augmentation system of an aircraft is used with a simulation. The simulation results show the proposed method is achievement. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2601
Volume: 11
Issue: 6
Page: 2962-2967
Publish at: 2013-06-01

Decoupling Control Strategy of D-STATCOM

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2358
Guangzheng Wang , Zeng Ping , Juan Zhang , Yujie Guo
 In Distribution Network, Distribution Static Synchronous Compensator (D-STATCOM) can stabilize turn-on point voltage, effectively reduce the transmission losses in power, improve the power factor and prevent the non-linear load. But under the circumstance of the d- and q-axis, D-STATCOM is a non-linear and strong coupling system, so decoupling control is very useful, that is because the decoupling control can ensure the output current fast track and have on different with the setting values. Study the decoupling control strategy of D-STATCOM, through the analysis of its basic structure, and then get the model of the coupling term. Due to avoid active and reactive current coupling, Fuzzy Immune PI Controller and inverse system method are combined to be used in the original system. Finally, the results are shown by the MATLAB simulation that the proposed decoupling control strategy is very good, because the performance is excellent, the structure is simple and easy to be implemented. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2684
Volume: 11
Issue: 6
Page: 3285-3292
Publish at: 2013-06-01

Formula Expression of Airgap Leakage flux Coefficient of Axial-Flux Permanent Magnet Motor

10.12928/telkomnika.v11i2.912
Xiao; Shandong University Gong , Yanliang; Shandong University Xu , Feng; Shandong Supervision and Inspection Institute for Product Quality Xin
Airgap leakage flux coefficient is one of the main parameters which must be given ahead of time when performing initial designs or getting performance results by magnetic circuit analysis for any kinds of electrical machines. Three -dimensional finite element method (3D-FEM) is the most reliable one to obtain the accurate leakage flux coefficient for axial-flux permanent magnet (AFPM) motor which definitely takes a much long time and is not advantageous to the motor’s initial and optimal design. By constituting the accurate lumped-parameter magnetic circuit (LPMC) model and computing the resultant magnetic reluctances, the analytical formula of the leakage flux coefficient of AFPM is given which is verified by 3D-FEM and the prototyped AFPM experiment. 
Volume: 11
Issue: 2
Page: 241-248
Publish at: 2013-06-01
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